One of my old coworkers had an issue with that when he was visiting the US. He was at his hotel room and he did not put the shower curtain on the inside of the tub and basically did not even use it and went about showering all willy nilly. He finished up and there was a bunch of water on the floor and he kind of just assumed the drain was slow. The other person staying in the room from the US went into the bathroom and wondered why the fuck the shower curtain was on the outside of the tub. My coworker was from India and just thought the curtain was there to cover you if someone wanted to take a leak.